[clang-tools-extra] [clang-tidy] Prevent false-positive in presence of derived-to-base cast in bugprone.use-after-move (PR #189638)

[via cfe-commits]

serge-sans-paille wrote:

> This is essentially a special case of tracking moves and uses of individual member variables, right? That's new territory for this check.

It is. This happens a decent amount of time in firefox codebase, so i wanted to fix in order to be able to apply it on that codebase.

https://github.com/llvm/llvm-project/pull/189638